reaction were elongated to β-oxo esters that were first reduced to β-hydroxy esters and then transformed into protected β-hydroxy aldehydes. Wittig–Horner–Emmons reaction with the anion of tetraisopropylmethylenebisphosphonate gave, after deprotection, the desired 4-hydroxy-6-purinyl- or -6-pyrimidinyl-1-hexenylphosphonic acids. A dimer, potential precursor of acyclic polynucleotides (APN), homomorphous with
已从 DNA 核碱基和丙烯酸叔丁酯开始制备了以天然脱氧核糖核苷酸为模型的无环卡巴核苷膦酸酯。从迈克尔型反应获得的产物被延长为 β-氧代酯,该酯首先被还原为 β-羟基酯,然后转化为受保护的 β-羟基醛。Wittig-Horner-Emmons 与亚甲基双膦酸四异丙酯的阴离子反应,去保护后得到所需的 4-羟基-6-嘌呤基-或-6-嘧啶基-1-己烯基膦酸。还制备了一种二聚体,一种与 DNA 同形的无环多核苷酸 (APN) 的潜在前体。